Portfolio 'Target start' and 'Target end' dates are slightly bugged in terms of date formats: https://jira.atlassian.com/browse/JPOSERVER-1049 && https://jira.atlassian.com/browse/JPOSERVER-2949
You have to use specifically the format it wants. In your excel change the date format to exactly 'd/MMM/yy' and then specify it during the import wizard.
As far as I remember it only accepts that one specific format. It's been a very long time and I can't find any notes to confirm it, but I do remember it being this way.
Try changing your dates in your input to
02/Feb/2022
"MMM" means an alphabetic abbreviation for the month, not numeric.
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